Cross-arm back-truss and clamp



A; B. CHANCE. CROSS ARM BACK TRUSS AND CLAMP, APPLICATION FILED FEB. I7. l9lI- 1,324,585. Patented Dec. 9,1919.

WITNESSES.

INVENTOR."

Ql dmw f ALBERT .2 mm; WWW 5/7 MM sirarnsraranr ermine.

Arrears. cannon, or ennrnanm, MISSOURI.

CROSS-ARM sacic raoss AND CLAMP.

assesses.

Specification of Letters Patent.

Patented Dec. 9, 1919.

Application filed February 17, 1917. Serial No. 149,263.

To all whom it may concern.-

Be it known that I, ALBERT B. CHANCE, a

citizen of the United States of America, re-.

siding at Centralia, inthe county of Boone and State of il lissouri, have invented a new and useful CrossArm Back-Truss and Clamp, of which the following is a speclfication, reference being had to theacconr and to provide other improvements in the devices of the invention as herein set forth. Other objects will be apparent from the following specification.

In the accompanying sheet of drawings illustrating the preferred forms of my invention, Figure 1 is a perspective view of a portion of a pole, a cross-arm, and the improved cross-arm back-truss and clamp of my invention; F ig. is a side elevation of a portion of a pole, a cross-arm, and the clamp of my invention, looking at the end of the cross-arm: Fig. 3 is a view similar to Fig. 2, with thecross-arm of Fig. 2 removed; Fig. 1 is a side elevation of the clamp shown in Figs. 1, and 3, with the clamping bolt removed: Fig. 5 is a plan view of the clamp shown in Fig. 4, without the clamping bolt; Fig. (5 is an edge elevation of the two clamping members of the clamp shown in Fig; {1, shown in separated relation; Fig. 7 is a plan view of the shoe which is attached to the ends of the cross-arm in Fig. 1; and Fig. 8 Is an elevation of the shoe shown 111 Fig. 7.

Like characters refer to like parts in the B and through the cross-arm 2, preferably as shown in F 1g. 1. A is a clamp WlllOh is attached to the back side of the pole Im the 7 position shown in Fig. 1. 6 is a heavy rod whlch extends through the clamp A as shown in Fig. 1, the ends of the rod 6 being attached to the shoes B B preferably as shown in Fig. 7 so that the cross-arm 2, the rod 6,.and the pole 1 between the middle of the cross-arm 2 and the middle of the rod 6, form a truss the primary object of which is tobrace'the cross-arm 2 against tensional stresses in either direction in the line wires or conductors which are carried by the pins 1 A, or against other stresses tending to strain the cross-arm 2 out of place. The truss member 6 may be tightened up as much as desirechby means of one or more nuts 7 on each end thereof as shown in Fig. 7 The truss member 6 is preferably tightly clamped in the clamp A so as not to slip therethrough when the truss is under a strain. A truss of this character will prevent the'cross-arm from being twisted out of place or torn from the pole under unusual stresses such as are occasioned by the breaking of oneor more of the line wires under extreme weather conditions.

The clamp A may be attached to the pole 1 as shown in Figs. 1 and 2, or as shown in Fig. 3. In Fig. 6 it will be seen that the clamp A is composed of two clamping members 11 and 12. I preferably thread the hole 13 in the clamping member 12, and make the hole 1A in the clamping member 11 large enough to clear the clamping bolt 8. The bolt 8 is preferably threaded on both ends to receive clamping nuts as shown in Figs. 2 and 3. The clamping member 12 is threaded onto the bolt 8 and the latter is extended through the pole 1' as shown in Figs. .2 and 3. Then, in Figs. land 2, the cross-arm 2 is put in place on the bolt 8, and the nut, or rnut and washer,--9 is tightened up on the bolt 8,

the member 12 of the clamp A, and-the nut,

or nutandwasher, 9 serving as clamping. members to clamp the pole 1 and cross-arm 2 tightly together therebetween. Now the truss member 6 maybe put in place between the clamping members 11 and 12 of the clamp A, and the nut 10 tightened upon the bolt 8 against the clamping member 11 as shown in Figs. 1, 2 and 3, the member 12 of theclamp A, and the member 11 and nut 10 serving as clamping members to clamp the truss member 6 tightly in place between the members 11 and 12 of the clamp A as shown in Figs. 1 and 2. Thus it will be seen that in the device of this invention there are two independent clamps provided, one by member 12, nut and washer 9, and a portion of the bolt 8, for clamping the pole and cross-arm together, and the other by the member 12, the member 11 and nut 10, and a portion of the bolt 8, for clamping the truss member 6 in place.

I may also use my clamp A for a cable messenger clamp if I desire, or for other purposes. As a cable messenger clamp I may use it in connection with a cross-arm 2 as shown in Fig. 2, or without a cross-arm as shown in dig. 3. In either Fig. 2 or Fig. 3, the cable messenger strand is clamped be tween the members 11 and 12 of the clamp A the same as the truss member 6 is clamped in place in the clamp A. In Fig. 2 the menu ber 12, and the nut, or nut and washer, 9 clamp the pole 1 and cross-arm 2 together therebetween, and the member 12, and the member 11 and nut 10 clamp the cable messenger strand between the members 11 and In Fig. 3, the member 12, and the nut, or nut and washer, 9 clamp the pole 1 therebetween, and the member 12, and the member 11 and nut 10 clamp the cable messenger strand 6' between the members 11 and 12, in this case also the two independent clamps being provided.

I may also use various modifications of the constructions set forth, if I desire.

The clamping member 12 is preferably provided with pointed projections 17 17 thereon adapted to embed themselves into the pole 1 or other suitable portion to help position the member 12 in place. The clamping member 11 is preferably provided with a projecting lug 15 thereon, extnding into a recess 16 in the member 12, for bold ing the member 11 from turning on the bolt 8 while the nut 10 is being tightened up.

The construction of the shoe B can be well understood from Figs. 7 and 8, and need not, therefore, be further described.

I do not wish to limit this invention to the particular details herein set forth, as various modifications thereof may be made or utilized without departing from the scope of the appended claims.

1 also wish it to be understood that the several features of the inventinon may he used either singly or collectively without departing from the scope of the appended claims.

What I claim as my invention is:

1. The combination with a pole and a cross-arm therefor, of a bolt extending through the pole and cross-arm and threaded on both ends, a clamp carried by the said bolt on the opposite side of the pole from the cross-arm, the said clamp having a pair of clamping. members one of which is screwed onto the said belt, a nut carried by the bolt on the opposite end thereof from the said clamp for clamping the cross-arm to the pole, a shoe for each end of the crossarm t attached thereto, a supporting member for the cross-arm extending through the said clamp and having the ends thereof attached to the said shoes, and a nut carried by the said belt for causing the said clamp to tightly clamp the said supporting member therein.

2. The combination with a pole and a cross-arm therefor, of a bolt extending through the pole and erossarm, a clamp carried by the said bolt on the opposite side of the pole from the cross-aim, the said clamp having a pair of clamping members one of which is secured to the said bolt, means carried by the said belt for clamping the cross-arm to the pole, a shoe for each end of the cross-arm and attached thereto, a supporting member for the cross-arm extending through the said clamp and having the ends thereof attached to the said shoes, and means for causing the said clamp to tightly clamp the said supporting member therein.

3. The combination with a pole and a cross-arm therefor, of a bolt extending through the pole and cross-arm, a clamp carried by the said bolt on the opposite side of the pole from the cross-arm and having a portion thereof secured to said bolt, a supporting member for the cross-arm extending through the said clamp and having the cuts thereof attached to the end portions of the cross-arm, and i'neans on the said bolt for clamping the cross-arm to the pole and the said supporting member in the said clamp independently.

As inventor ofthe foregoing I hereunto subscribe my name, this 12 day of February,

ALBERT B. CHANCE. lVitnesses JULIUs R. Enwauns, Frances CHANCE. 

